# 单引号字符串
str1 = 'hello'
# 空串
str2 = str()

print("空串====>",str2)

# 双引号字符串
str3 = "world"

# 三引号字符串(多行字符串)
str4 = ''' hello world
    hello 2025
 '''

str5 = """ hello 2025
    hello world
"""

print("三引号字符串====》",str4)

# 运算
# - 字符串加法
# - 字符串乘法

# 字符串加法(字符串拼接)
str11 = "hello python"
str22 = "hello world"
str1122 = str11 + str22
print(str1122)

print("---------------------------")

# 字符串乘法(重复字符串)
str33 = str11 * 3
print("str33====>",str33)

# str44 = str11 + 3
# print(str44) # 注意字符串与数字不能相加
